For part i.)

You know that 65% of dishwashers do NOT need repairs for 3 years. You select 8 dishwashers at random. Each has 65% chance of not needing repairs. We can extrapolate then. The chance of 1 dishwasher not needing repairs = (0.65). The chance of 2 not needing repairs is (0.65)(0.65). You can continue on from there. Does that make sense?